EP1384099A2 - Dispositif pour lentilles a memoire de forme et bords carres - Google Patents

Dispositif pour lentilles a memoire de forme et bords carres

Info

Publication number
EP1384099A2
EP1384099A2 EP02737902A EP02737902A EP1384099A2 EP 1384099 A2 EP1384099 A2 EP 1384099A2 EP 02737902 A EP02737902 A EP 02737902A EP 02737902 A EP02737902 A EP 02737902A EP 1384099 A2 EP1384099 A2 EP 1384099A2
Authority
EP
European Patent Office
Prior art keywords
lens
bore
magnet
collet
defining
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP02737902A
Other languages
German (de)
English (en)
Inventor
Kok-Ming Tai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Novartis Pharma GmbH
Ioltech SA
Original Assignee
Novartis Pharma GmbH
Novartis AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Novartis Pharma GmbH, Novartis AG filed Critical Novartis Pharma GmbH
Publication of EP1384099A2 publication Critical patent/EP1384099A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
    • B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
    • B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
    • B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
    • B24B9/14—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of optical work, e.g. lenses, prisms
    • B24B9/146—Accessories, e.g. lens mounting devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
    • B24B13/005—Blocking means, chucks or the like; Alignment devices
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/022—Mountings, adjusting means, or light-tight connections, for optical elements for lenses lens and mount having complementary engagement means, e.g. screw/thread

Definitions

  • the present invention relates to a collet for holding a lens and to a method of cutting a square edge on a lens.
  • buttons are typically cut initially from rod stock or sheets, or individually cast in cups using a curable liquid monomer composition.
  • buttons While it is possible in some cases to insert the button directly into a lathe collet, it is more typical to first attach the button to a separate metal block, the opposite end of which is configured for removable insertion into the collet of the lathe.
  • the button is typically adhered to the block with an adhesive. While the block and button are turned, the desired concave (or "base”) curve is lathed into the exposed end of the button opposite the adhered end. Subsequently, this semi-finished button is removed from this first base curve metal block.
  • this partially-finished button is adhered to a second metal block such that the lathe cut base curve of the button is adhered to the second metal block, again typically with pitch, while attempting to maintain proper alignment vis-a-vis the second metal block and the cut base curve.
  • This front curve metal block is mounted to a lathe collet for lathing the convex curve from the button. Subsequently, the lens must be removed from the front curve metal block.
  • the lathing process involves securing the button or the metal block, respectively, in a chucking device or collet that fixes the button in coaxial alignment with the lathe spindle. A cutting tool is then brought into contact with the rotating button, with the tool arranged and programmed to follow various pathways to achieve the desired finished surface.
  • These operations may also involve intermediate lathing operations, for example, cutting a desired precision thickness or cutting an edge chamfer in the button, prior to lathing the front curve.
  • these operations will involve lens edging and polishing operations on the lathe cut surfaces.
  • Current memory lenses are manufactured using a lathing process and are then polished by tumbling. The tumbling process removes the lathe marks to provide a quality surface. However, the tumbling process tends to round the edge of the lens, which in some applications is an undesirable artifact of the tumbling process. There is no lathing process that enables a wet lens to be securely held while being processed.
  • the invention employs a magnetic collet that uses magnetic attraction to clamp the central part of the lens, while exposing the edges to be processed.
  • the magnetic forces generated are sufficient to hold the lens and also have a self centering property.
  • the collet system includes a lens centering adapter and a magnet guide. The collet system allows the lens to be held while a cutting tool removes material from the circumference of the lens, thereby allowing for the cutting of a square edge on the completed lens. This process enables a lens to be finished with a square edge after the final lathing process is completed.
  • the disadvantages of the prior art are overcome by the present invention which, in one aspect, is a collet for holding a lens, having a first side and an opposite second side, during a lathing process.
  • the collet includes a first member and a second member.
  • the first member has a first end and a spaced apart second end.
  • the second end defines a first surface capable of engaging the first side of the lens.
  • the second member has a third end and a spaced apart fourth end.
  • the third end defines a second surface capable of engaging the second side of the lens.
  • At least a selected one of the first member and the second member includes a magnetic coupler that is capable of providing attractive magnetic force between the second end of the first member and the third end of the second member, thereby supporting a lens therebetween.
  • a selected one of the first member or the second member also includes an exterior surface that is capable of being secured to a mandrel of a lathe or drill.
  • the invention is a method of cutting a square edge on a lens having a first surface, an opposite second surface, and an outward peripheral edge.
  • a first member is attached to the mandrel of a lathe or drill.
  • the first member has a first end and an opposite second end that is shaped complementary to a surface of the lens.
  • the first surface of the lens is mounted on the second end of the first member.
  • a second member is placed against the second surface of the lens.
  • the second member has a third end and an opposite fourth end.
  • the third end is shaped complimentary to the second surface of the lens.
  • the second member is magnetically attractive to the first member so as to hold the lens there between.
  • the mandrel of the lathe or drill is rotated and a cutting tool is applied to the outward peripheral edge of the lens so as to cut a substantially flat surface on the outward peripheral edge of the lens.
  • FIG. 1 is a top perspective view of a collet according to the invention and a lens.
  • FIG.2A is a cross sectional view of a lens mounted onto a collet.
  • FIG.2B is a cross sectional view of a lens mounted onto a collet with a cutting tool being applied to the lens edge.
  • one embodiment of the invention is a collet 100 for holding a lens 102 having a first side 104 and an opposite second side 106, during a lathing process.
  • the collet 100 includes a first member 110, a second member 132, that is magnetically attracted to the first member 110 and an alignment tool 120 for centering the second member 132 on the lens 102.
  • the first member 110 has a first end 114 and a spaced apart second end 112.
  • the second end 112 defines a first surface 115 capable of engaging the first side 104 of the lens 102.
  • the second member 132 has a third end 134 and a spaced apart fourth end 136.
  • the third end 134 defines a second surface 135 capable of engaging the second side 106 of the lens 102.
  • the first member 110 includes a magnetic insert 130 that is attractive to the second member 132 (which could also be a magnet). The magnetic attraction between the first member 110 and the second member 132 supports the lens 102 during the lathing process.
  • the first member 110 includes a cylinder that defines a first bore 118 extending from the first end 114 toward the second end 112 and a second bore 116 extending from the second end 112 toward the first end 114.
  • the diameter of the second bore 116 is greater than the diameter of the first bore 118.
  • the magnetic insert 130 is disposed within the second bore 116.
  • the surface of the magnetic insert 130 is complementary in shape to a portion of the first side 104 of the lens 102 so that the lens 102 fits closely against the magnetic insert 130.
  • Both the magnetic insert 130 and the second member 132 could be made of neodymium, which can be highly magnetized. A thin coating, such as a lacquer of the type used with electronic components, may be applied to both the magnetic insert 130 and the second member 132 to prevent scratching of the lens 102.
  • the magnetic insert 130 could be made from a porous magnetic material. This would allow a vacuum to be applied to the lens through the first bore 118 and the second bore 116, thereby causing greater holding force to be applied to the lens 102.
  • the alignment tool 120 includes a mating surface 126 that is shaped complementary to a portion of the second side 106 of the lens 102, and an opposite exterior surface 127.
  • the alignment tool 120 defines a second member placement bore 128 that extends longitudinally from the mating surface 126 to the exterior surface 127 and has a shape that allows the second member 132 to be placed in the placement bore 128 and moved to a position that is adjacent the second side 106 of the lens 102.
  • the lens 102 is placed against the first member 110, which is affixed to the mandrel 108 of a lathe or drill (not shown).
  • the alignment tool 120 is placed against the second side 106 of the lens 102 and the second member 132 is slid through the second member placement bore 128 until it is against the second side 106 of the lens 102.
  • the alignment tool is then removed from the lens 102 and the second member 132.
  • the magnetic attraction between the first member 110 and the second member 132 supports the lens 102.
  • the mandrel 108 is rotated and a cutting tool 140 is applied to the outward peripheral edge of the lens 102 to cut a substantially flat surface 142.
  • lens 102 shown in the figures is convex on both sides, it should be understood that any lens configuration would work with the invention, including concave-concave and concave-convex, so long as the lens mating surfaces of the first member 110 and the second member 132 are shaped complementary to the shape of the lens surface with which they are in contact.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Gripping On Spindles (AREA)

Abstract

Un collet destiné à maintenir une lentille comprend un premier élément présentant des première et seconde extrémités qui définit une première surface pouvant venir en contact avec la première face de la lentille. Un second élément présentant des troisième et quatrième extrémités définit une seconde surface pouvant venir en contact avec la deuxième face de la lentille. Au moins un élément sélectionné parmi les premier et second éléments comprend un coupleur magnétique capable d'exercer une force magnétique d'attraction entre la seconde extrémité du premier élément et la troisième extrémité du second élément de manière à y maintenir la lentille. Un élément sélectionné parmi le premier élément et le second élément comprend également une surface extérieure pouvant être fixée à un mandrin de tour ou de drille.
EP02737902A 2001-03-27 2002-03-26 Dispositif pour lentilles a memoire de forme et bords carres Withdrawn EP1384099A2 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US27919501P 2001-03-27 2001-03-27
US279195P 2001-03-27
US33475301P 2001-10-31 2001-10-31
US334753P 2001-10-31
PCT/EP2002/003388 WO2002082129A2 (fr) 2001-03-27 2002-03-26 Dispositif pour lentilles a memoire de forme et bords carres

Publications (1)

Publication Number Publication Date
EP1384099A2 true EP1384099A2 (fr) 2004-01-28

Family

ID=26959519

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02737902A Withdrawn EP1384099A2 (fr) 2001-03-27 2002-03-26 Dispositif pour lentilles a memoire de forme et bords carres

Country Status (7)

Country Link
US (1) US20020159027A1 (fr)
EP (1) EP1384099A2 (fr)
JP (1) JP2004524177A (fr)
AU (1) AU2002312780A1 (fr)
CA (1) CA2439245A1 (fr)
TW (1) TW526106B (fr)
WO (1) WO2002082129A2 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2983755B1 (fr) * 2011-12-08 2014-08-29 Jean-Louis Negroni Procede de maintien d'un verre de lunettes sur une machine de type fraiseuse en vue d'operation de decoupe
CN104029096B (zh) * 2014-06-12 2017-01-04 绍兴绍力机电科技有限公司 光学元件修缘加工的电磁夹具及装夹方法
US9709769B2 (en) * 2014-12-10 2017-07-18 Becton, Dickinson And Company Methods for optically aligning light collection components and optically aligned light collection systems thereof
EP3546122B1 (fr) * 2018-03-30 2020-10-21 Essilor International Bloc de support de lentille et procédé pour bloquer et débloquer un composant de lentille optique
US11691363B2 (en) * 2020-03-20 2023-07-04 Steris Instrument Management Services, Inc. Method of forming and incorporating a polymeric lens within a lens housing
EP4035832A1 (fr) * 2021-01-28 2022-08-03 Carl Zeiss Vision International GmbH Pièce de blocage et procédé de blocage sous vide d'une ébauche de lentille

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4479332A (en) * 1982-09-16 1984-10-30 Ait Industries, Inc. Lens blocker and method
DE3319466C1 (de) * 1983-05-28 1984-03-01 C. Reichert Optische Werke AG, 1170 Wien Magnetische Kupplung fuer Teile eines optischen Geraets
US4580371A (en) * 1983-10-17 1986-04-08 Iolab Corporation Method for tumble grinding optical lens edge
US4856234A (en) * 1988-02-26 1989-08-15 Research Machine Center, Inc. Optical lens manufacturing apparatus and method
NL9402125A (nl) * 1994-12-13 1996-07-01 Roell Maria Van Druten Lensopspanning en opspanmethode.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO02082129A2 *

Also Published As

Publication number Publication date
AU2002312780A1 (en) 2002-10-21
WO2002082129A3 (fr) 2003-11-13
JP2004524177A (ja) 2004-08-12
US20020159027A1 (en) 2002-10-31
TW526106B (en) 2003-04-01
CA2439245A1 (fr) 2002-10-17
WO2002082129A2 (fr) 2002-10-17

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